Backwater control for sewers



Maw@

Nov. 3, 1942. D. H. ANDERSON BACKWATER vCON'IRIOL FOR SEWER Filed April4, 1941 Patented Nov. 3, 1942 2,300,856 BACKWATER CONTROL' FOR SEWERSDennis H. Anderson, Paducah, Ky., assignorto George J. Dehni, Chicago,Ill..4

Application April 4, 1941, serial No. 386.873

7 Claims.

The invention relates to backwater control apparatus for sewers.

One object of the invention is tovprovide improved apparatus forpreventing backow of water from a sewer to provide for Venting the basincontaining the float which closes the backow valve in the line leadingto the sewer in order to permit the operation of the float responsivelyto any backwater in the basin, and preventing the escape of air or gasesfrom the sewer through the basin except when necessary for the operationof the ioat.

Another object of the invention is to provide apparatus for preventingwater from a sewer from backing into a conduit leading to the sewer froma building, which is simple in construction and eiiicient in operation.

Other objects of the invention will appear from the detaileddescription.

The invention consists in the several novel features which arehereinafter set forth and are more particularly deiined by claims at theconclusion hereof.

In the drawing: Fig. 1 is a vertical section taken on line I-I of Fig. 2of apparatus embodying the invention. Fig. 2 is a plan.

The invention is exemplified in apparatus with the usual waste pipe 5for conducting the waste to a pipe 6 which leads to the sewer, and agatevalve I between waste pipe 5 and sewer pipe 5 for preventingbackiiow from the sewer.

A basin or tank 8 is connected to receive :duid from pipe 6 by aT-fitting 9 which is included in pipe 8, a short pipe section I0connected to tting 9, a cleanout fitting II, and a pipe section I2 whichis connected to a boss I3leading to the lower portion of the basin 8.Basin 8 has a cylindrical side wall, a bottom wall 8@1 and a top I4removably secured to the anged upper end of basin 8 by screws 14a. A oatI5 in basin 8 is guided vertically by an upstanding stem I5 which issecured to the bottom wall 8a of the basin and fits in a tubular guide8b in the oat. Normally, the float- I5 is in its lower position in thebasin, as shown in Fig. 1, so that the float will not be lifted by wasteflowing through fpipe 6. When stoppage occurs in sewer pipe 6, the wastewill flow through tting 9, pipe Il), fitting I I, and pipe I2 into thelower portion of basin 8 and cause the float to rise so it will functionto close the valve The operating connection between iioat I5 and theslidable stem 'la of valve a comprises a vertical link ITI, the lowerend of which is pivoted at I3 t0 the upper end 0f Stem la; a lever ISwhich 55 is centrally fulcrumed on a pivot 20 which is supe ported atthe'upper end of a standard or bracket 2| which has its lower end x'edlysecured to a lug 22 on the basin top I4 and has the outer end of one ofits arms pivotally connected at 23 to the upper end of link Il; a link24 pivoted at 25 to the outer end of the other arm of lever I9; and `a`stem 26, which has its. lowerv end fixed tothe top of lioat `I 5 and itsupper,` end pivoted, as vat 21, to the lower end of link 24. This.exemplifies a simple and efficient operating connection for operatingvalve i with a slidablegat'e and stem.

The top i4 has an opening therein and a nipple 32 is secured in aflanged ring 32a. `A valve-casing 28 has a downwardly extending branchwhich is screw-threaded to the upper end of nipple 32 which is fixedlysecured on the `top of cover I4.l

Stem 2E extends through nipplel 32, valve casing 28 and a packing box 29in the upper end of said casing.' Casing 23 has' apair of laterally andop'- positely extending members 33 to one` of which a vent pipe 34 isconnected. A screw plug 35 closes the other member 33. Two of theseextensions are provided so that the pipe 34 can be connected so a's toextend from either side of the tting for conveniencein 4installing thevent pipe. 'The latter is usually extended to a suicient elevation andoutside `of the building so that any gases from the sewerwill not Ybedelivered into the building.' f 4' In these installations it isdesirable to prevent gases from the waste passing to the sewer andthrough the basin 8 fromfpassing to the vent pipe 34,' both when thepipe 6 is carrying oif the waste and also when backwater from the sewerlifts the float l5 to Acloseuvalve l. For this purpose, casing 28 isprovided with an upwardly facing seat 37 for a valve 38 which is fixedto the stem 25 of float I5 andl is adapted to close communicationbetween the 'chamber in basin and the vent vpipe 34 when: the float isin its lowered position and the waste is being carried olf by the sewervpipe. Casing 28v is also provided with a downwardly facing seat 39 for avalve 40 which is also fixed to stem 2.6 and 'is adapted to'engage saidseatto cut ofi" communication between the chamber vin Vbasin lB and ventpipe 3'4v when the float has closed valvel and has been lifted bybackwater in the basin. These valves serve to` prevent gases `in vtank 8from escaping to vent pipe'34 when the float is either in its lowered orraised positions and also prevent water 'in basin 8 from passing to saidpipe in the event that the backwater is suiiicient tooverfiow tank 8. Alight spring, 42 in casing 23 is applied to stem 26 to of valve stem la.

insure the lowering of the iioat and the opening of valve 'I if theweight of the float and its stem is insufficient. During the movementsof the float between its raised and lowered positions, the chamber inbasin 8 will be placed in communication with vent pipe 34 but the basinwill be closed when the float is either in its raised or loweredposition. In the operation of oat I5 it is necessary to provide for theescape of air from basin 8 in order to permit the float I5 to be freelylifted by the backwater. As soon as the iioat I5 rises from its normalor lowered position, valve 33 will move away from its seat S'I andpermit the air to escape from the chamber in basin 8 to vent pipe 34until the valve 'I has been closed by the float. When the iioat has beenlifted, valve 49 will engage seat 39 and close the chamber in the basin.When the backwater flows out of basin 8, valve 40 will leave its seat 39and permit air to enter the chamber in basin 8 from pipe 34 until it isagain lowered and valve 33 engages seat 31. Thisl provides for openingthe basin so the operation of the oat I5 by the backwater will not beinterfered with by air pressure or suction and also provides for closingthe chamber in the basin so that no gases will escape therefrom when thefloat I5 is in'its normal or raised positions.

Link 24 is provided with a series of holes and lever I9 is also providedwith a series of holes for the adjustment of pivot pin 25 so that leverI9 and link I1 may be adjusted to vary the stroke Link IIisscrew-threaded at its upper end into a sleeve Ila so that the valve 'Imay be properly timed to close. Valves 38 and 40 may also be adjustablysecured by set-screws to stem` 26 to time the seating of said valves.

When the sewer pipe 6 is carrying oi the Waste, float I5 will be in itslowered position, as illustrated in Fig. l, and gate-valve 'I will beopen. Valve 38 will then prevent the escape of gases from the chamber inbasin Il. If the sewer pipe 6 fails to carry oi waste, the backwaterwill enter into the lower portion of the basin from tting 9 and liftthefloat I5. The upward movement of the iloat will lift stem 26 and link24 to rock lever I9 and lower link I'I to close the gate-valve 'I andpreventv backwater from iiowing upwardly through pipe 5. During theupward movementv of the float, valve 38 will be unseated and permit airto escape from basin 8. When valve 1 has been closed, valve 40 willclose against seat 39 and prevent gases from escaping from the basin 8.

The invention exemplifies a backwater control apparatusv for sewers,which is simple in construction and eflicientinoperation. The inventionalso exemplifies apparatus of this type which includes valve means foropening to atmosphere the basin containing the float for the freeoperation of the fioat and which closes the basin to prevent escape 'ofgases both when the float i`s`in its lowered position and also when ithas been lifted and the basin 8 contains backwater.

Theinvention is not to be understood as restrictedto the details setforth, since these may be modified within the scope of the appendedclaims, without departing from the-spirit and scope of the invention.

Having thus described the invention, what I claim as new vand desire tosecure by Letters Patent is: i

l. In backwater control apparatus, the combination with a sewage-pipe, awaste pipe leading from a building and connected to deliver waste to thesewage pipe, and a valve for preventing backflow from the sewage pipe tothe waste pipe, of a basin provided with an opening in its top, a floatin the basin, a slidable stem extending through the opening and havingits inner end connected to the float, an operating connection betweenthe backow valve and the stem of the oat for closing the backflow valvewhen the float is raised by backwater from the sewage pipe, and a valveon the stem of the float for closing the opening in the basin when vthefloat has been lifted by backwater.

2. In backwater control apparatus, the combination with a sewage pipe, aWaste pipe leading from a building and connected to deliver waste to thesewage pipe, and a valve for preventing backow from the sewage pipe tothe waste pipe, of a basin provided with an opening in its top, a floatin the basin, a. slidable stem extending through the opening and havingits inner end connected to the float, an operating connection betweenthe backflow valve and the stem of the float for closing the backflowvalve when the oat is raised by backwater from the sewage pipe, and avalve on the stem on the float for closing the opening in the basin whenthe iloat has been lowered and the backlow valve is open.

.3. In backwater control apparatus, the combination with a sewage pipe,a waste pipe leading from a building and connected to deliver waste tothe sewage pipe, and a valve for preventing backfiow from the sewagepipe to the waste pipe, of a basin provided with an opening in its top,a float in the basin, a slidable stem extending through the opening andhaving its inner end connected to the float, an operating connectionbetween the backflow valve and the stem of the float for closing thebackflow valve when the iioat is raised by backwater lfrom the sewagepipe, and valve-means on the stem of the float for closing the openingin the basin when the float has been lifted by backwater and when theoat has been lowered and the backow valve is open. t

4. In backwater control aparatus, the combination with a sewage pipe, awaste pipe leadingY from a building and connectedto deliver waste to thesewage pipe, and a valve for preventing backow from the sewage pipe tothe waste pipe, of a basin provided with an opening in its top, a iioatin the basin, a valve-casing on top of the casing, a slidable stemextending through the opening and the casing and having its inner endconnected to the float, an operating connection between the backow valveand the upper end of the stem of the oat for closing the backow jvalvewhen the float is raised by backwater from the sewage pipe, and a valveon the stem ofthe float for closing the opening in the basin when thefloat has been lifted by backwater.

5. In backwater control apparatus, the combination with a sewage pipe, awaste pipe leading from a building and connected to deliver waste to thesewage pipe, and a valve for preventing backflow from the sewage pipe tothe waste pipe, of a basin provided with an opening in its top, a floatin the basin, a valve-casing on top of the casing, a slidable stemextending through the opening and the casing and having its inner endconnected to the float, an operating connection between the backflowvalve and the upper end vof the stem'of the float for closing thebackflow valve when the float is raised by backwater from the sewagepipe, and a valve on the stem of the float for closing the opening inthe basin when the oat has been lowered in the basin and the backflowvalve is open.

6. In backwater control apparatus, the combination with a sewage pipe, awaste pipe leading from a building and connected to deliver waste to thesewage pipe, and a valve for preventing backfiow from the sewage pipe tothe Waste pipe, of a basin connected to receive fluid from the sewagepipe, a oat in the basin, a valve casing on the top of the basin andover said opening, a slidable stem extending through the opening andsaid casing and having its inner end connected to the oat, a valve onsaid stem for closing said opening, a standard on the tank, a levercentrally fulcrumed in the standard and having one of its ends connectedto the stem of the float, and a link between the backiiow valve and theother end of said lever.

'7. In backwater control apparatus, the combination with a sewage pipe,a waste pipe leading from a building and connected to deliver Waste tothe sewage pipe, and a valve for preventing backow from the sewage pipeto the waste pipe, of a basin connected to receive fluid from the sewagepipe, a oat in the basin, a valve casing over said opening and on top ofthe basin, a slidable stem extending through the opening and having itsinner end connected to the iioat, valves on said stem for closing saidopening when the float has been raised and when it has been lowered, astandard on the tank, a lever centrally fulcrumed in the standard andhaving one of its ends connected to the stem of the float, and a linkbetween the backflow valve and the other end of said lever.

DENNIS H. ANDERSON.

